Literary lothario Salman Rushdie is not going to land a fifth wife anytime soon. We’re told Michelle Barish has declined his offer of marriage and returned the 7-carat emerald-cut diamond ring he presented to her. Impatient Rushdie stepped in with the sudden proposal in December, two days after beautiful flame-haired Michelle — the estranged wife of entrepreneur Chris Barish — split up with New York Giants co-owner Steve Tisch. Sources tell us Michelle, who has a daughter, Bee, with Chris, had thought carefully about his offer but declined because she wants to focus on her child. Rushdie could not be reached, and Barish declined to comment.